Here's the Paper that is supposed to sell the legislative council on the Hong Kong Proposal:
http://www.legco.gov.hk/yr16-17/english/panels/edev/papers/edev20161128cb4-154-2-e.pdf
Mostly stuff we knew... Frozen Ever After in "Hand Carved Boats," the Luigi/aqutopia style ride, and immersive Marvel Land with all sorts of new experiences.
One thing that caught my eye that hadn't been in any of the press materials was this: "
Reimagining Project-In 2021, Hong Kong Disneyland will unveil a brand new experience for guests at a reimagined attraction. Details of the reimagined attraction and the technologies that will be incorporated into the guest experience will be announced at a later date."
There aren't many attractions at Hong Kong Disneyland. The only ones that it could be are like Winnie the Pooh, Jungle Cruise, It's a Small World, and Space Mountain. It might be a new FotLK or stage show, but with Moana and the Castle show going in that seems unlikely.
If I had to bet, Space Mountain looks like it could go. It's already operating with a Star Wars Overlay. Finish the destruction of TL by knocking out the last vestige of non Marvel. Slap on a space Marvel IP, and you're solid.
They could also be doing a GotG overlay of flying Saucers, but that seems more unlikely...
There's also interesting budget and spending info in their too, along with some other performance. Worth looking at...